Verified answer

What brand?

http://www.mrx.com.au/wireless/AironetModification...

http://www.lincomatic.com/wireless/usr2410.html

http://www.binarywolf.com/249/modify-wireless-adap...

http://www.binarywolf.com/249/faq.htm

http://mtarena.blogspot.com/2006/06/add-external-a...

http://www.wirelessforums.org/alt-internet-wireles...

http://www.google.com/search?hl=en&safe=off&rls=GG...

Well you would have to remove the cover of the PCMCIA card to find the antenna that is built into it.

Then it should be as simple as roughening up a portion of the antenna to make it easier for the solder to bond, as it is probably coated with something.